The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Share-Based Compensation - Schedule of Information with Respect to Outstanding and Exercisable Stock Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number of Options Outstanding	2,818,433	2,868,053	3,085,888	2,657,723
Options Outstanding, Weighted Average Exercise Price	$ 9.59	$ 9.86	$ 11.18	$ 14.27
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	6 years 1 month 20 days
Options Exercisable, Number Exercisable	1,847,335
Options Exercisable, Weighted Average Exercise Price	$ 10.13
Range of Exercise Prices $2.65 - $4.07 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	2.65
Range of Exercise Prices, Maximum	$ 4.07
Options Outstanding, Number of Options Outstanding	326,324
Options Outstanding, Weighted Average Exercise Price	$ 3.57
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	5 years 9 months 21 days
Options Exercisable, Number Exercisable	312,162
Options Exercisable, Weighted Average Exercise Price	$ 3.54
Range of Exercise Prices $4.15 - $4.15 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	4.15
Range of Exercise Prices, Maximum	$ 4.15
Options Outstanding, Number of Options Outstanding	250,732
Options Outstanding, Weighted Average Exercise Price	$ 4.15
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	6 years 7 months 9 days
Options Exercisable, Number Exercisable	188,049
Options Exercisable, Weighted Average Exercise Price	$ 4.15
Range of Exercise Prices $4.49 - $4.49 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	4.49
Range of Exercise Prices, Maximum	$ 4.49
Options Outstanding, Number of Options Outstanding	683,104
Options Outstanding, Weighted Average Exercise Price	$ 4.49
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	7 years 2 months 4 days
Options Exercisable, Number Exercisable	341,552
Options Exercisable, Weighted Average Exercise Price	$ 4.49
Range of Exercise Prices $5.00 - $6.51 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	5.00
Range of Exercise Prices, Maximum	$ 6.51
Options Outstanding, Number of Options Outstanding	346,012
Options Outstanding, Weighted Average Exercise Price	$ 6.00
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	5 years 9 months 3 days
Options Exercisable, Number Exercisable	316,904
Options Exercisable, Weighted Average Exercise Price	$ 6.01
Range of Exercise Prices $7.22 - $8.30 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	7.22
Range of Exercise Prices, Maximum	$ 8.30
Options Outstanding, Number of Options Outstanding	324,832
Options Outstanding, Weighted Average Exercise Price	$ 8.07
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	7 years 4 months 28 days
Options Exercisable, Number Exercisable	138,007
Options Exercisable, Weighted Average Exercise Price	$ 7.76
Range of Exercise Prices $8.63 - $13.80 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	8.63
Range of Exercise Prices, Maximum	$ 13.80
Options Outstanding, Number of Options Outstanding	377,061
Options Outstanding, Weighted Average Exercise Price	$ 12.65
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	8 years 8 months 8 days
Options Exercisable, Number Exercisable	104,429
Options Exercisable, Weighted Average Exercise Price	$ 9.65
Range of Exercise Prices $15.39 - $22.13 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	15.39
Range of Exercise Prices, Maximum	$ 22.13
Options Outstanding, Number of Options Outstanding	312,712
Options Outstanding, Weighted Average Exercise Price	$ 20.66
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	3 years 3 days
Options Exercisable, Number Exercisable	248,576
Options Exercisable, Weighted Average Exercise Price	$ 22.02
Range of Exercise Prices $26.15 - $26.15 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	26.15
Range of Exercise Prices, Maximum	$ 26.15
Options Outstanding, Number of Options Outstanding	36,144
Options Outstanding, Weighted Average Exercise Price	$ 26.15
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	1 month 24 days
Options Exercisable, Number Exercisable	36,144
Options Exercisable, Weighted Average Exercise Price	$ 26.15
Range of Exercise Prices $29.02 - $29.02 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	29.02
Range of Exercise Prices, Maximum	$ 29.02
Options Outstanding, Number of Options Outstanding	41,512
Options Outstanding, Weighted Average Exercise Price	$ 29.02
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	1 year 2 months 1 day
Options Exercisable, Number Exercisable	41,512
Options Exercisable, Weighted Average Exercise Price	$ 29.02
Range of Exercise Prices $30.67 - $30.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	30.67
Range of Exercise Prices, Maximum	$ 30.67
Options Outstanding, Number of Options Outstanding	120,000
Options Outstanding, Weighted Average Exercise Price	$ 30.67
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	1 year 4 months 17 days
Options Exercisable, Number Exercisable	120,000
Options Exercisable, Weighted Average Exercise Price	$ 30.67